Shure BLX14/SM31 Headworn Fitness Wireless System with SM31FH Fitness Headset Microphone
This Shure BLX wireless system combines professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, it’s the most accessible way to own the stage.
The BLX14/SM31 headworn wireless system includes a BLX4 wireless receiver, BLX1 bodypack transmitter, SM31 fitness headset microphone, power supply, clothing clip, windscreens, and user guide.
The BLX4 single channel receiver features simple setup, intuitive controls, and microprocessor-controlled internal antenna diversity. It includes 1/4" and XLR audio outputs and two-color audio status indicator LED. One-touch QuickScan frequency selection quickly locates the best open frequency in case of interference.
The durable BLX1 bodypack features a lightweight, ergonomic design and adjustable gain control. It comes equipped with power and battery status LED, 2 AA batteries that provide up to 14 hours of continuous use and has an operating range (line of sight) of 300 ft (91 m).
The rugged and durable SM31FH is a cardioid condenser microphone constructed with hydrophobic materials that make it ideal for true performance in fitness instruction applications. The moisture-repellent cartridge housing ensures a long product life by protecting the microphone from the corrosion damage that causes typical fitness instruction headsets to fail. Available in bundled BLX wireless systems, the SM31FH features TA4F 4-pin (TQG) connectors that make it a viable replacement for any Shure wireless headset system.
Note: When purchasing separate wireless components, please match their frequency bands to ensure proper system operation.
BLX14/SM31 Headworn Wireless System:
BLX4 Single Channel Receiver:
SM31FH Fitness Headset Condenser Microphone:
BLX1 Bodypack Transmitter:
| BLX4 Wireless Receiver | |
|---|---|
| Output Impedance | XLR connector: 200 Ω, 1/4" (6.35 mm) connector: 50 Ω |
| Audio Output Level | XLR connector: –27 dBV (into 100 kΩ load); 1/4" (6.35 mm) connector: –13 dBV (into 100 kΩ) Ref. ±33 kHz deviation with 1 kHz tone |
| RF Sensitivity | -105 dBm for 12 dB SINAD, typical |
| Image Rejection | >50 dB, typical |
| Housing | Molded ABS |
| Power Requirements | 12–15 V DC @ 160 mA (BLX88, 320 mA), supplied by external power supply (tip positive) |
| Dimensions (H x W x D) | 1.57" (40 mm) X 7.40" (188 mm) X 4.06" (103 mm) |
| Weight | 8.5 oz (241 g) |
| SM31FH Headset Microphone | |
| Type | Electret Condenser |
| Frequency Response | 45 to 20,000 Hz |
| Polar Pattern | Unidirectional (Cardioid) |
| Output Impedance @ 1 kHz | 600 Ω |
| Audio Output Level | -50 dBV/Pa |
| Signal-To-Noise Ratio @ 1 kHz | 66 dB |
| Maximum SPL 1000 Ω load, @ 3% THD | 145.0 dB |
| Dynamic Range @ 1 kHz, 1000 Ω Load | 117.0 dB |
| Equivalent Output Noise Typical, A-Weighted | 28 dB |
| Power Requirements | +5 V DC (nominal), 10 V maximum (DC bias) |
| Polarity | Positive pressure on diaphragm produces positive voltage on pin 3 with respect to pin 1 |
| Cable | 45" (1.1 m) |
| Connector | TA4F |
| Weight | 2.11 oz (60 g) |
| BLX1 Bodypack Transmitter | |
| Audio Input Level | Gain max: -16 dBV maximum; min (0 dB): +10 dBV maximum |
| Gain Adjustment Range | 26 dB |
| Input Impedance | 1 MΩ |
| RF Transmitter Output | 10 mW, typical |
| Housing | Molded ABS |
| Power Requirements | 2 LR6 AA batteries, 1.5 V, alkaline |
| Battery Life | Up to 14 hours (alkaline) |
| Dimensions (H x W x D) | 4.33" (110 mm) x 2.52" (64 mm) x 0.83" (21 mm) |
| Weight | 2.6 oz (75 g) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
